Boiler furnace



- April 9, 1929. E. A. PACKARD BOILER FURNACE 2 Sheets-Sheet l FiledNov. 5, 1925 E. A. PACKARD BOILER FURNACE April 9, 1929.

Filed Nov. 3, 1925 2 Sheets-Sheet 2 Suva/nto@ 33mg abme/13d PatentedApr. 9, 1929.

UNITED STATES 1,708,486 PATENT OFFICE..

EDW'IJSI A. PACKARD, OF YONERS, NEW YORK, .ASSIGNOB TO INTERNATIONALCOH- BUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATIONOF DELAWARE.

Borana rURNAcE.

Application led November 3, 1925. Serial No. 66,442.

This invention relates to boiler furnacesV and it has for its primaryobject the provision of a novel, compact arrangement of boiler furnaceoccupying a mininnun of both ground area' and height, whereby initialplant investment is greatly reduced and steam generated with a unitmuchsmaller than at the present time required in standard practice.

-Another object of the invention is to pro- -vide a boiler-furnace ofthe characteristics described by virtue of which the remainder of theinstallation,-particularly where the fuel used is in the .form ofpulverized coal,- can be conveniently accommodated in a small building.

Other and .more specific advantages. and objects will appearhereinafter. The foregoing, together wth'sueh other objects as mayhereinafter appear, are ob-' tainedby means of aconstruction which Ihave illustrated in preferred form the accompanying drawinvs, whereinFig. 1 is a horizon al' section thru a boiler- :furnace embodying myimprovements;

Fig. 2 is a vertical section thru the boilerfurnace'of Fig. 1, and

v Figs. 3 and 4 are views similar to Figs. 1 and 2, but illustrating amodication of the 3o invention.

Referring now to the arrangements of Figs. 1 and 2, it will be seen thatI have Iprovided a furnace, the combustion space of which is verylargely defined by tubes subjected to radiant heat. The furnace issomewhat horse-shoe shaped in eros section, the rear portion of thecombustion space being defined by a bank of vertical boiler tubes 7connected to the upper and lower drums 8 and 9 respectively, the sidesand the front being formed by vertical tubes 10. On the outside of thetubes 10 is a refractory or other suitable form of shell 11, the top ofthe combustion space being closed by refractory roof12. Beneath, isarefractory ash .p horse-shoe shaped header l4leads from the drum 9around the outside of the pit 13 to a point just short of the' drum 9,this 5o header 14 lying somewhat below the shell 11. The tubes 10 riseupwardly from this header 14 to a similar header 15, this header,however,` connecting with the upper drum 8 at the opposite end andextending around.

the roof 12 to a point just short of the drum S. This header lies abovethe shell 11, whereby straight tubes 10 may be employed.

The tubes 7 are battled so as to provide a plurality of passes. Thecirculation is from the lower drum to the upper drum thru those rows ofthe tubes 7 nearest the source of greatest heat and thence downwardlythru those rows of tubes 7 removed from the source of greatest heat.Circulation also takes place from the drum 9 around thru the header 14and thence upwardly thru the tubes 10 to the header 15 and around suchheader into the drum 8. It will be noted that the connection of theheader 14 to the drum 9 and of the header 15 to the drum 8 is such thatthe distance to be traversed is the same thru all of the tubes 10,whereby short circuiting with possible burning out of tubes isprevented.

The powdered coal is admitted thru one or more burners 16, preferablywith all of the air required for combustion and with the air and c/oalintimately mixed so as to form turbulent combustion with a short hotflame. combustion being approximately completed before thetirst pa isreached. The flame is thus essentially a vertical one and the refuseparticles of combustion are thrown' down into the ash pit., theseprecipitating particles passing thru a water screen formed of spacedtubes 17 connected into the circulation of the boiler and operating tocool such refuse particles below slag forming temperature, whereby theparticles remain in individual form capable of ready removal. The tubes17 are connected at the rear to a header 18 and at the front to a header19. Certain of the downcomer tubes of the bank of tubes 7 are carrieddown thru the drum 9 to the header 18. comers 20 lead from the header 19to the drum 8 so that circulation takes p lace thru the screen in thedirection indicated by the arrow.

The fuel being burned turbulently, th'e -furnace temperature isroportionately high and heat is absorbed y the radiant heat tubes at avery high rate. in consequence of which a large quantity of steam isproduced with but a small portion of the tubes now' required to producethe same quantity of steam. The flame also short, the ertical height ofthe boiler-furnace is cut own.

Referring now to the construction of Fig.

f division plate 21 a ipe-2.2 leads to the drum 8. Circulation is, tyerefre, thru the header 14, the tube'slfjlththe two'jhalves of theheader a and the. pipes :22, the. water and steam having to travelthesame distance thru all tubes 10.

The water Ascreen in thiscase inclines oppositely, downcomers 20aleading to the header 19, the rear header 18 being dispensed with andthe tubes 17a being connected to upeomer tubes of the bank of tubes 7.l'-

1. In combination a horse-shoe shaped boiler-furnace, an upper and alower drum, a horse-shoe shaped upper header and a lower header of thesame shape, one end of the upper header being connected to the upperdrum and one end of the lower header being connected to the lower drum,tubes connecting the two headers and defining the front and sides of thecombustion space of the furnace, and tubes connecting the drums, saidlatter tubes defining the rear of the combustion space.

2. In combination, a horseshoe shaped boiler furnace, an upper 'and'lower drum, horseshoe shaped upper and lower' headers iconnected to theupper and lower drum respectively, tubes connecting the two headers anddefining the front and sides of the combustion space of the furnace, andtubes connecting the said drums, saidlatter tubes defining the rear ofthe combustion space.

3. In combination, a horseshoe shaped boiler furnace, an upper and lowerdrum, a horseshoe shaped upper header and a lower header of the sameshape, one end only of the upper header being connected to the upperdrumand the opposite end only of the lower header being connected to thelower drum, tubes connecting the two headers and defining combustionspace of the -furnace and tubes connecting the upper and lower drums.

In testimony whereof, I have hereunto signed Iny name.

EDWIN A. PACKARD.

